Belt composed of longitudinal separated bands



Jan. 27, 193 1. A. HARMEL. BORN BRADFER 1,790,145

BELT COMPOSED OF LONG'ITUDINAL SEPARATED BANDS Filed N v. 21. 1928 "I! gI 'IIIIIA 'IIIII/I ll/Ill ll": ::*"IIIII Val/ 2 k a. III/Ill 'IIIIII '1Fatented Jan. 27, 1931 7 r UN Ts- STATES:

LAURIE AUGUSTINE HARMEL BORN BRADIEEB}; g e ting; mm 'a aflssmma fro seaCIETE ANONYME: VEVT'ABLISSEMENTS SMELDUR, MAN IEACTORY .013- nEnrs iorSTAINS, FRANCE BELT ooiarosnn orv LoNGIrUnrnAi; Bhiwns Application filedNovember fzl', 19 28, Serial No. f3 21,003, and

The invention relates tov belts composed of longitudinal: separatedbands and its object;

is to devisesuch belts superior to those known hitherto in manyrespects.

The known belts of this kind composed of longitudinal separated bandsare held together by means of transverse straps. The

present invention devises a belt of this kind,

with longitudinal bands composed of two, three or four layers ofleather,"balata or tissue and so on, connected between them in the Vtransverse direction by means of thin, fiexible straps. of leather,preferably parchment leather, or spring steel, these straps belnginserted between the difierent layers of the bands and fixed (by simplenails in case of leather and by riveting for steel) only to the outerlongitudinal bands, the purpose of such construction being to leave freeplay to the inner layers of the belt, adhering to the pulley,-and,furthermore, to dissimulate the heads of the nails or. rivets.

The differentlayers constituting the longitudinal bands are connectedbetween them in the sense of depth by forkedrivets placed be-. tween thecross-straps in such niannerthat the belt passing over the pulley ispermittedto bend around the ranges of rivets, forming so' as to sayhinges. The rivets placed be:

tween the cross-straps, are countersunk with regard to'the surfacefrictioning on the pulley, so as to avoid all contact with the latter.The drawings appended illustrate in the way of example, a's-anembodiment of the in-. vention, a belt composed ot'two superposed layersof leather bands. I

Fig. 1 shows a part of such belt in plan view; v

Fig. 2 is a cross-section according to line 2'2 of Fig. 1; s v Fig. 3 isa longitudinal section according to line 38 of Fig. 1. I

The longitudinal bands of-about 15 to 20 cm. of width are, according tothe shown embodiment, formed by the superposition of two thickness 1 oflayers ot lea-her; viz; the intet iayta tad theouter layer5,"preferably"ofl thesaime de gr'ee of extensibilityin order to permit]an integral power-transmission; The layers of leather are of course ofappropriate quality The longitudinal bands are connected be tween theminthe cross sense byrst'ra-ps' of l about12-to 25 mm; of width,appropriate to" gthe diameter of the pulley and "thin and flex-f 1iblefandvat-thesan ie time havinga certain i I ,rigidity necessary-atthe lmornent'"of:iincou plinggthe pulley. 'In order to olo'tai'n this-j]effectflt was thought" preferable to employ for straps a parchmentleatherfor leather driedxin raw state, whichmaterial is very 7 well.apt, for iwork fdem'anding continuous bending. :Theappropriatethicknesslof the straps willbe' about 1 mm-.to2,5-mm.- Eventuallyinstead of-leather straps galvanized spring steelmay be employed, moreespecially for-belts working in wet spots, the steel being QnlyA/IO to10/10 mm.-,z;--

. The-cross-straps are inserted be'tw'een'the' layersdfand.ban'diare'fiXed-only to-the longitudinal' outer'bands b,'by nailing orriveting (according as to whether the materialemployed for these strapsis leather ors'teel), so as to ensure treelplayof the layer aapplied-tothe-pulley andtodissimulate at the sametime the heads of thenails or rivets d:

by the layers a y g -The arrangement ofthe cross-straps between'thedifl'erentlayers constituting the longitudinal bahdsxprocures to thebelt the fluidity and; rigidity of the straps; this" is not, theincase jwith the straps placed outwarolly,accorc ling to someibelts of this kindexecuted hitherto, r

.The difierent layers-a, b constitutingthef longitudinal bands-are.,connectedto each other by forked rivets cl placed betweenthecro'ss'straps c; (Fig; 1') in: order to permit no i the flexion ofthe belt and to counter-sink the rivets by their bent pointse withregard to the surface frictioning on the pulley, so as to avoid Contactwith the rivets.

The depressions formed by the lower layers a are exaggerated in Fig. 3,so as to illustrate the counter-sunk position of the rivets and theimpossibility to deteriorate the pulley and also, the formation of smallsuction re- 1, in which the outerlongitudinal members 7 are non-sinuousand thetransverse connecting members are flat. I

r 3. A. transmission belt as claimed in claim 1, in which the inner andouter longitudinal members are secured together by fork rivets.

In witness whereof I afiix my signature.

LAURE AUGUSTINE HARMEL, born BRADFER.

cesses 7 increasing the adherence of the belt to r the pulley. r:

At the spots of these recesses, the leather is acted upon onlyby suctionand not by the rivets e'and do 'not-rub on the pulley, except wheretheintercalated cross-straps 0 of steel pass.

' The straps c of steel avoid .wenkeni lgcof I the layer a, thewholeeffort being taken up y er gidand flexible cross-strapsand the i aleather acting only as a kind 'of'mattress; Consequently the leatherdoes not'under o. anycefi'ort whatsoever, Wherethe longitu ip j nal andcross bands are crossing each other.

The elongation. of the belt is nearly zero and alwaysby far smaller thantheone of the belts hitherto used.

Theoretically, the distance between "two neighboring cross-straps cought not 'to surpass 12mm... for double belts, and18 to 22 -mm.1QIfourfold'belts, inorder to permit squeexingof the straps at both sidesbyriveting of the hands, a, b, the-straps being per:

mittedthereby' to transmit the lateral force 1 V at the moment ofclutching without any deformation ofthe belt.

It mustbenoted that the layers a, b being separated, the maximum J ofadherence is obtained owing to the lateral flexibility; the layers a, bcan consistof leather of the same kind, 'and even of very soft leather;the lat-- eral rigidity exists at 'thesametime a-s'the flexibility andthis result is obtained bydrawing nearer the straps 0, so as to fix themrigidly' b riveting together the layers a, b.

The invention is of course not limited to the embodiment represented:permitting quite a scope] of modifications, with regard to the the.outer members, and transverse connect ing members arranged inthespacesbetween said inner and outer members and secured tothe latterat. points substantially inter- 'med-iatethose at which the-inner andouter members-are secured together. r

'2 Atransmission belt as claimed in claim

